build: clear Gradle 10 deprecations, bump wrapper to 9.7.1

[soloturn]

AI-assisted change proposal. Filed by agent driven by @soloturn via GDD.

Summary

• Clears the Gradle-10-scheduled-for-removal deprecations found building against Gradle 9.7.1: Groovy space-assignment in gradle/common.gradle, multi-string dependency notation in each subproject's build.gradle, and implicit parent-project property lookups (nuiVersion, jomlVersion, geomVersion).
• Bumps the wrapper from 8.2.1 to 9.7.1 so the warnings are visible at all.

Test plan

• ./gradlew build -x test --warning-mode=all — clean of Gradle-10 warnings, BUILD SUCCESSFUL.

Related

• Companion to build: clear Gradle 10 deprecations, bump wrapper to 9.7.1 Terasology#5362 which did the same for the engine repo and flagged gestalt/TeraNUI as needing their own PRs.

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[BenjaminAmos]

It appears that this change (or a previous one) broke the JUnit tests.

org.gradle.api.internal.tasks.testing.RequiresTestFrameworkTestDefinitionProcessor$TestFrameworkNotAvailableException: Failed to load JUnit Platform.  Please ensure that all JUnit Platform dependencies are available on the test's runtime classpath, including the JUnit Platform launcher.
    at org.gradle.api.internal.tasks.testing.junitplatform.JUnitPlatformTestDefinitionProcessor.assertTestFrameworkAvailable(JUnitPlatformTestDefinitionProcessor.java:101)
    at org.gradle.api.internal.tasks.testing.junit.AbstractJUnitTestDefinitionProcessor.startProcessing(AbstractJUnitTestDefinitionProcessor.java:50)
    at org.gradle.api.internal.tasks.testing.SuiteTestDefinitionProcessor.startProcessing(SuiteTestDefinitionProcessor.java:43)

[soloturn]

Fixed in 6b3616e - Gradle 9 dropped the auto-supplied JUnit Platform Launcher, so bumping the wrapper here needed it declared explicitly. Added testRuntimeOnly("org.junit.platform:junit-platform-launcher:1.6.2") to nui/build.gradle, version-paired with the existing junit-jupiter 5.6.2. Jenkins is green on the current head including the test stage.